Journal
NEW JOURNAL OF CHEMISTRY
Volume 45, Issue 5, Pages 2431-2442Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj05120a
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- International Islamic University Pakistan (IIUI)
- Higher Education Commission of Pakistan (NRPU) [3660]
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The conductivity of TiO2 nanomaterials can be enhanced by incorporating carbonaceous materials such as SWCNTs and GO. A comparative study on SWCNTs/Mn3O4-TiO2 and GO/Mn3O4-TiO2 composite materials showed that the tailored nanohybrid structures played a significant role in hydrogen evolution reaction and solar induced photodegradation of methyl orange. The properties of the composite materials make them promising candidates for multifunctional purposes.
The conductivity of metal/metal oxide-doped TiO2 nanomaterials is enhanced by the incorporation of carbonaceous materials, e.g. single-walled carbon nanotubes (SWCNTs) and graphene oxide (GO). Here, a comparative study was conducted on SWCNTs/Mn3O4-TiO2 and GO/Mn3O4-TiO2 composite materials for hydrogen evolution reaction (HER) through water splitting and solar induced photodegradation of methyl orange (MO). The morphology of GO/Mn3O4-TiO2 showed a quasi-spherical network of TiO2 with patches of Mn3O4 nanoparticles dispersed on GO sheets. SWCNTs were adhered on the Mn3O4-TiO2 surface. The novel features of carbonaceous materials (GO/SWCNTs), fast electronic transition properties of SWCNTs and pi-pi interaction of carbon materials in composites extended the absorption edges in the visible region and thereby led to reduction of band gap energy. Mn-Ti-C linkages in ternary composites were confirmed through FTIR and Raman studies. Quenching of PL intensity indicated suppression of electron-hole recombination on the surface of SWCNTs/Mn3O4-TiO2. XPS demonstrated bonding configuration and oxidation states of components of the SWCNTs/Mn3O4-TiO2 composite. The SWCNTs/Mn3O4-TiO2 nanohybrid structure with tailored properties played a noteworthy role in HER with a low onset potential of similar to 320 mV at 10 mA cm(-2), a low R-ct of similar to 43.3 omega, a small Tafel slope of similar to 86 mV dec(-1) and the highest degradation of MO (similar to 98%) compared to other catalysts. Our findings suggest that the prepared catalysts are promising candidates for multifunctional purposes.
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